A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cooling of the Building Structure by Night-time Ventilation
In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning is increasingly applied even in moderate and cold climates, like in Central and Northern Europe. Particularly in these cases, night-time ventilation is often seen as a promising passive cooling concept. Many successful examples of passively cooled buildings demonstrate the possibility of providing good thermal comfort conditions without the need for energy-intensive air conditioning systems. However, due to uncertainties in the prediction of thermal comfort, architects and engineers are still hesitant to apply passive cooling techniques. The basic concept of night-time ventilation involves cooling the building structure overnight in order to provide a heat sink during the occupancy period. As this requires a sufficiently high temperature difference between the ambient air and the building structure, the efficiency of night cooling is highly sensitive to climatic conditions and hence also to climate warming. In the first part of this PhD study, the potential for passive cooling of buildings by night-time ventilation was evaluated by analysing climatic data, without considering any building-specific parameters. A method for quantifying the climatic cooling potential (CCP) was developed based on degree-hours of the difference between building and external air temperature. Applying this method to climatic data of 259 stations shows very high night cooling potential over the whole of Northern Europe and still significant potential in Central, Eastern and even some regions of Southern Europe. However, due to the inherent stochastic properties of weather patterns, series of warmer nights can occur at some locations, where passive cooling by night-time ventilation alone might not be sufficient to guarantee thermal comfort. Possible time-dependent changes in CCP were assessed for the period 1990-2100, with particular emphasis on the Intergovernmental Panel on Climate Change (IPCC) "A2" ...
Cooling of the Building Structure by Night-time Ventilation
In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning is increasingly applied even in moderate and cold climates, like in Central and Northern Europe. Particularly in these cases, night-time ventilation is often seen as a promising passive cooling concept. Many successful examples of passively cooled buildings demonstrate the possibility of providing good thermal comfort conditions without the need for energy-intensive air conditioning systems. However, due to uncertainties in the prediction of thermal comfort, architects and engineers are still hesitant to apply passive cooling techniques. The basic concept of night-time ventilation involves cooling the building structure overnight in order to provide a heat sink during the occupancy period. As this requires a sufficiently high temperature difference between the ambient air and the building structure, the efficiency of night cooling is highly sensitive to climatic conditions and hence also to climate warming. In the first part of this PhD study, the potential for passive cooling of buildings by night-time ventilation was evaluated by analysing climatic data, without considering any building-specific parameters. A method for quantifying the climatic cooling potential (CCP) was developed based on degree-hours of the difference between building and external air temperature. Applying this method to climatic data of 259 stations shows very high night cooling potential over the whole of Northern Europe and still significant potential in Central, Eastern and even some regions of Southern Europe. However, due to the inherent stochastic properties of weather patterns, series of warmer nights can occur at some locations, where passive cooling by night-time ventilation alone might not be sufficient to guarantee thermal comfort. Possible time-dependent changes in CCP were assessed for the period 1990-2100, with particular emphasis on the Intergovernmental Panel on Climate Change (IPCC) "A2" ...
Cooling of the Building Structure by Night-time Ventilation
Artmann, Nikolai (author)
2009-01-01
Artmann , N 2009 , ' Cooling of the Building Structure by Night-time Ventilation ' , Aalborg .
Miscellaneous
Electronic Resource
English
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